
In the novel her mood was a bit more complicated. Its root was the fact that she continuously thought of herself as a reader in the novel, not as a real person in a real world. That's why she didn't give a damn of what would happen with others, the country etc, because it's just a novel and her purpose to be there was to make ML and FL to regret. She left alone Helios because he truly regretted it, meanwhile Diana didn't. Kael wasn't this open to her in the novel when he said he didn't want Diana's dethronement and she didn't become angry, but more like someone who lost her footing. The sole reason for her existence in the novel, in her eyes, was her vendetta but her only important person threw this away to go and rescue his old love. So she became pretty depressed and empty meanwhile Kael did go and rescued Diana. Later it was Helios who told her that it wasn't for Diana but for the royal authority and Karl only did it because he asked him for it. Helios also told Hestia that she wanted something more fundamental, not simply the dethronement but for their regret and she succeeded. That was the real starting point when she finally found her place in the novel.

i totally agree with you. even while reading the novel i felt that was what kael was feeling. he just didn't care about the whole drama with diana anymore, he just wanted to focus on his happy married life with hestia.
i feel like a lot of ppl don't accept his reasoning but it felt justified to me. He's not a vengeful, wrathful ML, he's not the madman redflag powerhouse. He's a calm and serious man who focus only on the person he loves
That's what was bothering about her whole approach on the revenge thing
She wanted Kael to also feel as revengeful as her, because in her mind, without revenge, she had no use to him anymore
So there were multiple moments in the story where she purposefully avoided even thinking about a future where there wasn't the need to work for a revenge plan
It bothered me that she had this fixation
All the comments saying "valid crash out" last chapter were insane to me, because she wasn't spiraling for the reason you all thought
She was panicking because she thought her role in the story was over, since Kael no longer wanted to pursue revenge
I don't know about the novel, but Hestia's "tantrum" as people also called in the comments, was totally in character in my opinion
She also has shown that she can lose her cool very fast when it comes to Kael interacting with both Helios and Diana
I don't find it anticlimactic because to me this was a point of conflict between Hestia and Kael that was awaiting to be resolved for a long time
The author has shown that Kael has overcome his heartbreak and is moving towards the future, while Hestia clings to revenge and what happened in the past
So it was clear that at some point they would clash
Also yall, c'mon
The opposition of love isn't hate, it's indifference
Kael genuinely does not give a shit about Diana anymore
That's why he's able to look beyond stripping her of her title
He's not doing that for her sake, he's doing it because he belongs to the royal faction and doesn't want to harm the king
In my opinion that's spectacular
it's absolutely delicious to me that he's so indifferent
Should he have approached things differently?
Totally
Since he doesn't care about Diana, might as well make Hestia happy and enact revenge